Analytical method of irrigation efficiency of large size irrigation district

In this paper, omission of some levels of canals, use of irrigation return water, and level of management are considered as factors which affect the irrigation efficiency of large size irrigation district. Quantitative expressions of coefficients representing the omission of levels of canals and use of irrigation return water are obtained through strict mathematical deduction. Coefficient representing the level of management is suggested based on the management standard reached, and an improvement is suggested to the traditional multiple multiplication method of calculating of irrigation efficiency.